[unconed]

The backwards compatibility is okay, but the author should also plan a more optimal replacement encoding that ditches the legacy compatibility, and require new implementations to support both.

Otherwise there is no way to sunset the hacks.

[solardev]

They should just make a new format. It's not clear if this is an improvement over AVIF either.

[Nyan]

We've already got JPEG-XL as a good replacement format, but some feel that jeopardizing its adoption is a sensible cause.